﻿// ===================================
// <copyright>LogoUI Co.</copyright>
// <author>Vlad Spivak</author>
// <email>mailto:vlads@logoui.co.il</email>
// <created>20/00/10</created>
// <lastedit>Saturday, November 20, 2010</lastedit>

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the 'Software'), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
//
// <remarks>Part of this software based on various internet sources, mostly on the works
// of members of Wpf Disciples group http://wpfdisciples.wordpress.com/
// Also project may contain code from works of Nito and OpenLight group</remarks>
// ====================================================================================//


using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Windows.Data;

namespace LogoFX.Infra
{
    static class EnumHelper
    {
        private static readonly IDictionary<Type, object[]> Cache = new Dictionary<Type, object[]>();

        public static object GetBoxed(System.Enum s)
        {
            Type enumType = s.GetType();
            object ret = GetValues(enumType).Where(ss => ss.ToString() == s.ToString()).FirstOrDefault();
            return ret;
        }
        public static T[] GetValues<T>()
        {
            Type enumType = typeof(T);

            if (!enumType.IsEnum)
            {
                throw new ArgumentException("Type '" + enumType.Name + "' is not an enum");
            }

            object[] values;
            if (!Cache.TryGetValue(enumType, out values))
            {
                values = (from field in enumType.GetFields()
                          where field.IsLiteral
                          select field.GetValue(enumType)).ToArray();
                Cache[enumType] = values;
            }
            return values.Cast<T>().ToArray();
        }

        public static object[] GetValues(Type enumType)
        {
            if (!enumType.IsEnum)
            {
                throw new ArgumentException("Type '" + enumType.Name + "' is not an enum");
            }

            object[] values;
            if (!Cache.TryGetValue(enumType, out values))
            {
                values = (from field in enumType.GetFields()
                          where field.IsLiteral
                          select field.GetValue(enumType)).ToArray();
                Cache[enumType] = values;
            }
            return values;
        }

    }

    /// <summary>
    /// Provides a way to fix weird behavior of selectors in Silverlight
    /// </summary>
    public class EnumConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            object o = EnumHelper.GetBoxed(value as System.Enum);
            return o;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return value ?? EnumHelper.GetValues(targetType)[0];
        }
    }

    /// <summary>
    /// Provides collection of <see cref="Enum"/> values based on one value
    /// </summary>
    public class EnumSourceConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null)
                return null;
            else
                return EnumHelper.GetValues(value.GetType());
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return value;
        }
    }
}
